# 购物车信息管理视图文件
from django.shortcuts import render
from django.http import *
from django.shortcuts import redirect
from django.urls import reverse
from myadmin.models import *

def add(request,pid):
    # 添加购物车
    # 从session中获取当前店铺中所有的菜品信息，并从中获取要放入购物车的菜品
    product = request.session['productlist'][pid]
    product['num'] = 1  # 初始化当前菜品购买量
    # 尝试从session中获取名字为cartlist的购物车信息，若没有返回{}
    cartlist = request.session.get('cartlist',{})
    # 判断当前购物车中是否存在要放进购物车的菜品
    if pid in cartlist:
        cartlist[pid]['num'] += product['num']  # 增加购买量
    else:
        cartlist[pid] = product # 放进购物车
    # 将carlist放入购物车
    request.session['cartlist'] = cartlist
    print(cartlist)
    # 跳转到点餐首页
    return redirect(reverse('web_index'))

def delete(request,pid):
    # 添加购物车
    # 尝试从session中获取名字为cartlist的购物车信息，若没有返回{}
    cartlist = request.session.get('cartlist', {})
    del cartlist[pid]
    # 将carlist购物车信息放入到session中
    request.session['cartlist'] = cartlist
    return redirect(reverse('web_index'))


def clear(request):
    # 清空购物车
    request.session['cartlist'] = {}
    return redirect(reverse('web_index'))

def change(request):
    # 更改购物车
    cartlist = request.session.get('cartlist', {})
    pid = request.GET.get("pid",0)  # 获取要修改的菜品id
    m = int(request.GET.get('num',1))  # 要修改的菜品的数量
    if m < 1:
        m = 1
    cartlist[pid]['num'] = m  # 修改购物车的数量
    # 将carlist购物车信息放入到session中
    request.session['cartlist'] = cartlist
    return redirect(reverse('web_index'))



